Three men cleaning out the tanker from the inside were found unconscious Tuesday by co-workers. One of the men later died, the other two were flown to a Des Moines hospital.

Jeff Vander Molen told KCCI his brother, another co-owner of the truck wash, is one of the two men being treated in the hospital. He said the family doesn't know what went wrong.

"It's been a tough time for family, can't believe the support we've got from the community from the fire departments, ambulances, I mean it was just chaos at the scene with all the people there helping," said Vander Molen.

Vander Molen is one of three brothers who operate their parents' Truck Wash. He said his brother Brent was washing out a tanker, along with two inmates from a Newton prison on a work program.

He said he doesn't know how long they had been cleaning when they were found unconscious inside. He said Brent, the injured brother, and also the mayor of Sully, was put in a drug-induced coma by doctors Tuesday night. One of the inmates is also in the hospital. The other was later pronounced dead.

Vander Molen said that he and his family are very confused as to what went wrong Tuesday, because according to their paperwork, the tanker trailer that was being washed out by the three men was carrying animal fat from a Cargill facility, something that would not be considered hazardous.

A spokesman for OSHA said he could not comment on this case during his agency's investigation, but said in general, animal products over time can break down or decompose, which can create toxic gasses.

Vander Molen says his family's business has employed inmates from Newton who are transitioning out of prison for over 10 years. He said he is deeply saddened over the death of one those men.

"You don't get to know them a terrible lot, but you get to know them enough. I don't know their families or kids, but you get to know them enough working with them. They're just good guys. They all are."

Vander Molen said his brother Brent has shown positive signs Wednesday as he slowly comes out of his medically-induced coma, talking to family and medical staff.

The names of the two inmates have not been released.

OSHA's spokesman said investigators have six months to wrap up their investigation.

You saw the breaking news right here at five! Three men cleaning a tanker were found unconscious yesterday by co-workers. One of the men later died, the other two were flown to Des Moines. KCCI's Mark Tauscheck spoke with one of the owners of the truck wash this afternoon. Jeff Vander Molen told me his brother Brent, another co-owner of the truck wash, is one of the two men being treated in the hospital...he says the family doesn't know what went wrong...but they do know what the tanker had been hauling. 30:04-"it's been a tough time for family, can't believe the support we've got from the community from the fire departments, ambulances, I mean it was just chaos at the scene with all the people there helping." Jeff Vander Molen is one of three brothers who operate their parent's Truck Wash... he says his brother Brent was washing out a tanker, along with two inmates from a Newton prison on a work program...he doesn't know how long they had been cleaning when they were found unconscious inside... Brent, the injured brother, and also the mayor of Sully, was put in a drug- induced coma by doctors last night...one of the inmates is also in the hospital, the other was later pronounced dead. 32:47-"vander molen told me this afternoon that he and his family are very confused as to what went wrong yesterday because according to their paperwork, that tanker trailer that was being washed out yesterday by the three men, was carrying animal fat from a cargill facilty - something that would not be considered hazardous." A spokesman for OSHA said he could not comment on this case during his agency's investigation - but said in general animal products over time can break down or decompose - which can create toxic gasses...and that's where his investigators can sometimes see issues with the atmosphere inside storage and transport tanks. 28:58-"it's just been a great program, it always has been." Vander Molen says his family's business has employed inmates from Newton who are transitioning out of prison for over 10 years...he says he is deeply saddened over the death of one those men. 29:31-"you don't get to know them a terrible lot, but you get to know them enough - I don't know their families or kids, but you get to know them enough working with them they're just good guys, they all are." Jeff Vander Molen says his brother Brent has shown positive signs today as he slowly comes out of his induced coma... talking to family and medical staff... The names of the two inmates have not been released... Mark so when will we find out what caused all this? OSHA's spokesman says they have 6 months to wrap up their investigation.

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